AW: VC Phaser using the LM13600

Magnus Danielson magnus at analogue.org
Fri Jan 8 02:51:48 CET 1999


>>>>> "B" == BJ  <zzynt at swipnet.se> writes:

Hi!

I just thought someone would jump on this one... ;)

 B> Magnus Danielson wrote:
 >> As for lead/lag - you can't break the casuallilty without getting into
 >> trouble with Einstein. There have been some trouble regarding how low
 >> intensity (photon per photon) interferometers actually work with this
 >> respect and the best explanation comes from the transaction
 >> description of this interaction. Also, further trouble have been in
 >> the discussions of how fast a jump over a barriers (such as in a
 >> tunnel diod) actually takes, there are people discussing speeds in
 >> superluminar levels (that is, _faster_ than light). In Germany they
 >> had some fun and sent Mozart at 4.5 times the speed of light, without
 >> any noticable distorsion over a distance of 11 cm. Hope this is
 >> confusing ;)
 >> 
 >> Cheers,
 >> Magnus

 B> Well , isn't that infact to get in trouble with Einstein?
 B> Since he said, at the speed of light the time is still!!
 B> Or iam lost in space?

Well, this is a bit confusing... Einstein said that nothing could
travel faster than light and that due to time dilation time would
stand still... well, dependent on the reference frame ofcoarse.

The problem that I refered to, the interferometer, where announced by
Richard Feynman (Nobel lautherate in physics for quantum
electrodynamics - which he claimed that no one understands!) as one of
the big mysterious that no one understands. The problem is that even
when you pass a single photon through the interferometer it will
suddenly behave as a wave and interfer with itself and suddenly
reappear as a photon for the photo-multipliers set out there. This is
odd since the photon (as seen as a particle) could only take on one
passage of the two possible (there is two slits). The handshaking of
which way to take will happen at light speed, while the time stays
still for us observers... hmm. I think I got that right. It is a bit
confusing, but you have to accept waves going backwards in time and
so. This is allowed by the Schroedinger equation, but we are just used
to do them in one direction. This also happends over impossible
barriers, where a photon or electron may tunnel over. They have done
this with lasers and microwaves. There are several interesting
articles online on this. There are some less-serious or less-valid
things to this... as you might imagine. Check out the FTL FAQ for
instance: http://hepweb.rl.ac.uk/ppUK/PhysFAQ/FTL.html

It is most annoying, but it seems to hold as far as I can tell.

 B> BJ
 B> (who practises Einsteins "relativ'ely" theory all the tima at the speed
 B> of light in my bed!!) :)

You got a mighty fast bed I hear...

Cheers,
Magnus



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